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Re: [Help-glpk] instability problem

From: Andrew Makhorin
Subject: Re: [Help-glpk] instability problem
Date: Thu, 13 Nov 2008 00:07:38 +0300

> Could someone please tell me what problem I encounter with?

> I run glpsol and receive this message printed out like forever:

> spx_simplex: numerical instability (primal simplex, phase II)

> If GLPK cannot solve my model, why doesn #39;t it stop but continues
> trying to solve?

It is difficult to determine if it is reasonable to continue the search
or not, because in many cases numerical instability does not prevent the
solver to complete the search. This, of course, should be considered as
a defect of the glpk solver.

It seems that you are using some old version of glpk. Try using the most
recent version, which is 4.33.

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